Both versions use a Bosch MG1 engine computer that is unlocked before tuning, an 8-speed ZF automatic whose torque limits need a gearbox tune, and the same upgraded high-pressure fuel pump for ethanol files. Bolt-on parts don't cross between them: the 2.9 has two turbos and two downpipes, the 3.0 one of each.
Power by stage, car by car
| Car | Years | Turbos | Stock | Stage 1 | Stage 2 | Stage 3 | Stage 4 |
|---|---|---|---|---|---|---|---|
| Audi S4 B9 | 2017–2024 | One, inside the V (3.0) | 354 PS | 430–450 hp | 445–470 hp | 530–620 hp | 630–740 hp |
| Audi RS5 B9 | 2018–2024 | Two, inside the V (2.9) | 450 PS | 500–525 hp | 525–605 hp | 590–680 hp | 710–740 hp |
Figures are the tuners' own claims from each guide, on the fuel each tuner states.
What the guides say about this engine
- European S4s from the 2019 facelift have a 3.0 TDI diesel instead, which these petrol tunes don't fit. The Audi S4 B9 guide
- On the 2.9, Stage 2 adds little on pump fuel: the factory downpipes already flow well, so the next real step is fuel and ethanol. The Audi RS5 B9 guide